[access-uk] Re: For David Wood: was: combi-boilers. longish reply
- From: "David W Wood" <g3yxx@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <access-uk@xxxxxxxxxxxxx>
- Date: Wed, 9 Apr 2008 15:07:44 +0100
John:
Very interesting.
When your installers are their, maybe ask them if there is such a device.
If not, how does the system function properly?
If it is a sealed system, then heating up will increase its pressure and
when hot maybe blow the pressure valve - this could explain why it is
loosing heat.
I wouldn't like to make an assumption however without knowing more about the
system - please let us know when they have been?
David
-----Original Message-----
From: access-uk@xxxxxxxxxxxxx [mailto:access-uk@xxxxxxxxxxxxx] On Behalf Of
John Wilson
Sent: Wednesday, April 09, 2008 9:58 AM
To: access-uk@xxxxxxxxxxxxx
Subject: [access-uk] Re: For David Wood: was: combi-boilers. longish reply
Hello again David,
I understand the need for this expansion ability you
mention. Yes, the pressure does go up when the system is
working/hot. The pressures I have been mentioning have been
when the system is working.
As far as this 6 by 8 inch pressure vessel is concerned I
have nothing of this kind on the outside of the boiler, so I
must assume that it is internal to the boiler unit.
Thanks, all the same.
John.
----- Original Message -----
From: "David WE Wood" <g3yxx@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: <access-uk@xxxxxxxxxxxxx>
Sent: Wednesday, April 09, 2008 6:58 AM
Subject: [access-uk] Re: For David Wood: was: combi-boilers.
longish reply
> Hello John:
>
> Assuming that the system is sealed, which is quite likely
> as you are
> mentioning that you have a pressure gauge on the system,
> when the system is
> cold, the pressure will be less than when it is hot as the
> water will expand
> as it heats to, say, 60C.
>
> In order to keep the pressure at a constant level (you
> mention a typical 1.5
> bar) their needs to be scope for expansion to maintain
> that pressure.
> This is achieved with a pressure vessel which is made of
> metal and typically
> has a three quarter inch BSP female connector and is
> fitted onto either the
> flow or return of the system which has a T connector onto
> which it fits.
> In a typical 3 bedroom house, this would be about 6 inches
> in diameter, and
> about 8 inches long.
> Across its equator is a flexible membrane, and at the
> opposite end to its
> BSP connection is a Schrader valve.
> When the system is cold, a pump is applied to the valve to
> establish the 1.5
> bar pressure.
> As the system expands, the membrane is displaced thus
> increasing the volume
> of the system, hence maintaining the chosen pressure.
> Boyle's law:
> Pressure times volume equals constant.
>
> The size of this vessel is determined in proportion to the
> total of the
> volume of the system.
>
> Sorry for the mix of quoted units, to make it more
> correct, I should have
> mentioned atmospheres in stead of bars, thus making the
> description totally
> in imperial units!
>
> Hth
>
> David
>
>
> -----Original Message-----
> From: access-uk@xxxxxxxxxxxxx
> [mailto:access-uk@xxxxxxxxxxxxx] On Behalf Of
> John Wilson
> Sent: Wednesday, April 09, 2008 12:54 AM
> To: access-uk@xxxxxxxxxxxxx
> Subject: [access-uk] For David Wood: was: combi-boilers.
>
> Hello David,
>
> Thanks for the feedback.
>
> However, what is this pressure vessel. I have never heard
> of
> such a thing. Perhaps my type of combi-boiler does not
> employ one. There is no mention of this in the manual I
> was
> left and no one has mentioned such a thing to me.
>
> John.
>
> ----- Original Message -----
> From: "David W Wood" <g3yxx@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
> To: <access-uk@xxxxxxxxxxxxx>
> Sent: Tuesday, April 08, 2008 7:01 PM
> Subject: [access-uk] Re: O/T but does anyone on the list
> have an Ideal Isar combi-boiler?
>
>
>> Hi John:
>>
>> I have had a sealed system in my work premises for some
>> 20
>> years, purely for
>> 16 radiators on the ground floor with a conventional
>> vented system with 10
>> radiators and hot cylinder on the first floor.
>>
>> I have always had the same problem as you with the sealed
>> system, and no
>> sign of leaks.
>> One important point is to make sure the pressure vessel
>> is
>> kept topped up -
>> this should be shown to you by the installers.
>>
>> The reason for the boiler rattling will be because of
>> build-up of gases
>> which will accumulate in the high point or points of the
>> installation.
>>
>> David
>>
>>
>>
>> -----Original Message-----
>> From: access-uk@xxxxxxxxxxxxx
>> [mailto:access-uk@xxxxxxxxxxxxx] On Behalf Of
>> John Wilson
>> Sent: Tuesday, April 08, 2008 4:04 PM
>> To: Access UK
>> Subject: [access-uk] O/T but does anyone on the list have
>> an Ideal Isar
>> combi-boiler?
>>
>> Hello All,
>>
>> Sorry for the O/T posting but I'm sure that some people
>> on
>> here will be able to compare notes and give valuable
>> feedback.
>>
>> I have had an Ideal Isar combi-boiler now for a year and
>> am
>> of the opinion that the pipework may be leaking under the
>> downstairs floor boards. Other people I have spoken to
>> (but
>> with different boilers) tell me that they rarely, if
>> ever,
>> have to top up the pressure in their central heating
>> system.
>> However, I find that I have to do this every three or
>> four
>> weeks. The pressure will have fallen from the recommended
>> 1.5 bars to only 0.5 bars or even lower, causing the
>> boiler
>> to become noisy with a vibrating effect.
>>
>> Does anyone else find this to be the case with these
>> boilers
>> and systems? I am about to report it to the fitters but
>> wanted to know what the norm for the frequency of
>> pressure
>> top up of these systems is firstly from any other users.
>>
>> All contributions appreciated.
>>
>> John.
>>
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